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Reaction Kinetics - 5
1.
Phenolphthalein
a) Transition State
b) Nicke
c) Indicator
d) Energy of activation.
2.
Effective collisions
a) Indicator
b) Nicke
c) Energy of activation.
d) Transition State
3.
Activated complex
a) Concentration of optically active substances.
b) Transition State
c) Indicator
d) Energy of activation.
4.
Vegetable oil
a) Nicke
b) Indicator
c) Energy of activation.
d) Transition State
5.
Which one of the following correctly represents the units of the rate constant, k for a first order reaction?
a) mol
-1
dm
-3
s
b) S
-1
c) mol dm
-3
s
-1
d) mol dm
-3
s
6.
The following reaction is first order with respect to P and Zero order with respect of Q P+Q Product. If the rate constant doubles for each 100C rise in the temperature, which of the following sets of conditions will give the greatest rate of reaction? [P] mol dm
-3
[Q] mol dm
-3
Temperature
o
C
a) 0.3 0.1 30
b) 0.1 0.3 30
c) 0.1 0.2 40
d) 0.2 0.2 30
7.
Why does the exothermic reaction C(diamond) C(graphite) not occur spontaneously?
( ΔH= 3KJ mol-1)
a) Graphite has delocalized electrons.
b) The density of graphite is less than that of diamond.
c) At tetrahedral configuration is always more stable than a planar one.
d) The change from diamond to graphite has high activation energy.
8.
If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours. What is its half-life?
a) 8 hours
b) 6 hours
c) 4 hours
d) 3 hours
9.
The two steps involved in the gas phase reaction
X+2Y XY2 are shown below
i. X+Y slow XY
vv. XY+Y fast XY2
What is the rate equation for the overall reaction?
a) Rate = K [x30][y]1
b) Rate= K[x]0[y]1
c) Rate = K[xy]1[y]1
d) Rate= K[x]0[y]2
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